Medicare Part D eligibility in 2026 is broader than most people expect: nearly every Medicare beneficiary qualifies to enroll, since the only requirement is being enrolled in Medicare Part A and/or Part B and living in a plan's service area. Part D plans cannot turn anyone away for a preexisting condition or current health status, and there is no income test to simply join a plan. The real eligibility questions in 2026 are about timing (when you can enroll without penalty), cost (whether you owe a late enrollment penalty), and extra assistance (whether your income qualifies you for Extra Help).
CoveredUSA breaks down basic Part D enrollment eligibility, the 2026 enrollment windows, the late enrollment penalty formula, and the income and resource limits for Extra Help, the Low-Income Subsidy that pays part or all of a beneficiary's drug costs, below. For full Extra Help income tables and the application walkthrough, see Extra Help eligibility. For what Part D actually pays for, see does Medicare cover prescription drugs.
Coverage Breakdown
| Eligibility Path | Who Qualifies in 2026 | Cost Impact | 2026 Notes |
|---|---|---|---|
| Standalone Part D plan (Original Medicare) | Yes, anyone with Part A or Part B | Monthly premium (average roughly $36 in 2026) plus deductible up to $615 | 360 standalone PDPs offered nationwide in 2026 per KFF |
| Medicare Advantage drug plan (MA-PD) | Yes, if enrolled in an MA plan with drug coverage | Often bundled into one premium; deductible and copay tiers vary by plan | Cannot also enroll in a separate standalone PDP |
| Employer, union, VA, or other creditable coverage | Eligible to delay Part D without a penalty | No Part D premium while creditable coverage continues | Must keep proof of creditable coverage to avoid the late penalty later |
| Extra Help (Low-Income Subsidy) | Income-gated add-on, not automatic | $0 deductible, capped copays, $0 cost after the $2,100 2026 out-of-pocket cap | 2026 income limit about $23,940 single, $32,460 couple (150% FPL) |
Standalone PDP count and average premium trend per KFF's 2026 Part D snapshot. Extra Help figures per Medicare.gov and the CMS CY2026 LIS resource limits memo.
Source: medicare.gov, kff.org, cms.gov
Direct answer: who qualifies for Medicare Part D in 2026
Yes. Anyone enrolled in Medicare Part A and/or Part B qualifies to join a Part D drug plan in 2026, with no health or income screen for basic enrollment. Timing matters more than eligibility itself: missing your Initial Enrollment Period without other creditable drug coverage triggers a permanent late enrollment penalty added to every future premium.
Basic Part D eligibility requirements
Basic Medicare Part D eligibility has just two requirements in 2026: enrollment in Medicare Part A, Medicare Part B, or both, and residence in the service area of a plan you want to join. Part D plans use guaranteed issue during a valid enrollment window, meaning a plan cannot deny you, charge you more, or delay your coverage because of a preexisting condition, current prescriptions, or overall health status. This differs sharply from private individual health insurance before the ACA, where preexisting conditions could block coverage entirely.
Income and assets play no role in enrolling in a standard Part D plan itself; income only matters if you also want the Extra Help subsidy described below. You can choose Part D coverage through a standalone Prescription Drug Plan (PDP) if you have Original Medicare, or through a Medicare Advantage plan that bundles drug coverage (MA-PD). Medigap policies never include drug coverage, so Medigap holders need a separate standalone PDP.
When you can enroll: Part D windows in 2026
Part D eligibility opens during your Initial Enrollment Period (IEP), a 7-month window centered on the month you turn 65 or your 25th month of Social Security disability benefits. Miss that window and you can still enroll during the 2026 Annual Enrollment Period, October 15 to December 7, 2026, for coverage that starts January 1, 2027. Medicare Advantage enrollees also get the MA Open Enrollment Period, January 1 to March 31, 2026, but that window allows only one plan switch and does not let a standalone Original Medicare enrollee add a new PDP.
Special Enrollment Periods (SEPs) let you enroll outside these windows if you lose employer or union drug coverage, move out of your plan's service area, gain or lose Medicaid or Extra Help eligibility, or move into or out of a nursing facility. Each SEP has its own timing rule, typically 2 to 3 months from the qualifying event, so report the change to Medicare or Social Security promptly.
The Part D late enrollment penalty
Medicare eligibility for Part D comes with a cost consequence if you delay: the late enrollment penalty applies when you go 63 or more consecutive days without Part D coverage or other creditable prescription drug coverage after your Initial Enrollment Period ends. The penalty is calculated as 1% of the 2026 national base beneficiary premium, $38.99, multiplied by the number of full months you went without coverage, then added permanently to your monthly Part D premium for as long as you have Part D.
Creditable prescription drug coverage means coverage expected to pay, on average, at least as much as standard Part D coverage, including many employer or union plans, TRICARE, VA drug benefits, and qualified State Pharmaceutical Assistance Programs. Your plan sponsor must send an annual notice telling you whether your coverage is creditable; keep that notice as proof if you enroll in Part D later.